Issue #14681 has been updated by ioquatix (Samuel Williams). Assignee set to ioquatix (Samuel Williams) ---------------------------------------- Bug #14681: `syswrite': stream closed in another thread (IOError) https://bugs.ruby-lang.org/issues/14681#change-107878 * Author: ioquatix (Samuel Williams) * Status: Open * Assignee: ioquatix (Samuel Williams) * ruby -v: 2.5.0 * Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN ---------------------------------------- Perhaps related to https://bugs.ruby-lang.org/issues/13632 Here is a sample to reproduce the issue. ``` #!/usr/bin/env ruby require 'thread' puts RUBY_VERSION 100.times.collect do Thread.new do input, output = IO.pipe worker = Thread.new do sleep(0.1) output.syswrite('.') end input.read(1) input.close output.close worker.join end end.each(&:join) ``` If you run this, you will get output like so: ``` 2.5.0 #<Thread:0x00007fb7a4956ee8@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a50bb468@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4964250@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a49386f0@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a493ab08@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a495fb88@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a50bbb98@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4948820@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4939820@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a486a458@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4860020@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4970258@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4973f48@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4948618@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a495f728@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a495f868@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4848628@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4843858@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4809400@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a5085278@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a495e0f8@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a48417d8@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a5037c80@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4948398@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4948c30@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4939b18@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4957500@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a480a9b8@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a5036d30@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a5085c50@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a495e2b0@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a495f070@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a495e6e8@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a49572d0@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a495e580@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a494a350@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4811060@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a50842b0@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a494bb10@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a493ae00@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a495e878@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a494be30@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4809c70@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a480a4e0@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a50b90f0@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:11 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) #<Thread:0x00007fb7a4965600@/private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:8 run> terminated with exception (report_on_exception is true): Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) Traceback (most recent call last): 1: from /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `block (3 levels) in <main>' /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/16789369-c982-4cbc-a0b3-c836af60bf03:13:in `syswrite': stream closed in another thread (IOError) Exited with status 1 after 0.291 seconds ``` However, you can clearly see from the order of the sample code it's not possible for such an error to occur. `#close` is only invoked after a successful `#read` which is only possible after a successful `#write`. Yet, the error implies that the write failed because it was already closed. -- https://bugs.ruby-lang.org/